Ok lens cleaning expert is in,
We never use a lens pen in photography, pressuring any particle even dust to the lens will scratch the coating. coatings are as durable as a very soft wood. We need to use a good blower and soft quality brush thats all. (oil painters quality real camel hair brushes with cut handle will fit in your camera bag easily.
How do we clean lens with from greasy remarks like fingerprints? The keyword is isopropyl alcohol (IA), as pure as possible, 99% is the best. we put one drop IA on the lens with a qTip circularly beginning from the center, and immedialty dry the IA with a quality lens paper before IA dries out, in the same manner/circular direction.
We try not to clean lens with IA unless we are helpless, we always use lens caps paranoidly, not the unnecessary crappy UV and such filters for a good resolution.
Again never lenspen ever.
BTW what was the name of the silicon Pentax sensor cleaner, I thought it was like ICK-1 or something..
Originally posted by F-Stop Clean it yourself. I bought a Sensor Klear pen, this is what one of the local camera repair/sales store uses: